/*
 * Copyright ©2017 贾维程. All rights reserved.
 */
    $(document).off('click.bs.dropdown.data-api');
//自动展开
$('.nav .dropdown').mouseenter(function(){
    $(this).addClass('open');
});
//自动关闭
$('.nav .dropdown').mouseleave(function(){
    $(this).removeClass('open');
});

